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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef SBK_CONTAINER_H
#define SBK_CONTAINER_H
#include "sbkpython.h"
#include "shibokenmacros.h"
#include "shibokenbuffer.h"
#include <algorithm>
#include <iterator>
#include <optional>
#include <utility>
extern "C"
{
struct LIBSHIBOKEN_API ShibokenContainer
{
PyObject_HEAD
void *d;
};
} // extern "C"
// Conversion helper traits for container values (Keep it out of namespace as
// otherwise clashes occur).
template <class Value>
struct ShibokenContainerValueConverter
{
static bool checkValue(PyObject *pyArg);
static PyObject *convertValueToPython(Value v);
static std::optional<Value> convertValueToCpp(PyObject pyArg);
};
// SFINAE test for the presence of reserve() in a sequence container (std::vector/QList)
template <typename T>
class ShibokenContainerHasReserve
{
private:
using YesType = char[1];
using NoType = char[2];
template <typename C> static YesType& test( decltype(&C::reserve) ) ;
template <typename C> static NoType& test(...);
public:
enum { value = sizeof(test<T>(nullptr)) == sizeof(YesType) };
};
template <class SequenceContainer>
class ShibokenSequenceContainerPrivate // Helper for sequence type containers
{
public:
using value_type = typename SequenceContainer::value_type;
using OptionalValue = typename std::optional<value_type>;
SequenceContainer *m_list{};
bool m_ownsList = false;
bool m_const = false;
static constexpr const char *msgModifyConstContainer =
"Attempt to modify a constant container.";
static PyObject *tpNew(PyTypeObject *subtype, PyObject * /* args */, PyObject * /* kwds */)
{
allocfunc allocFunc = reinterpret_cast<allocfunc>(PepType_GetSlot(subtype, Py_tp_alloc));
auto *me = reinterpret_cast<ShibokenContainer *>(allocFunc(subtype, 0));
auto *d = new ShibokenSequenceContainerPrivate;
d->m_list = new SequenceContainer;
d->m_ownsList = true;
me->d = d;
return reinterpret_cast<PyObject *>(me);
}
static PyObject *tpNewInvalid(PyTypeObject * /* subtype */, PyObject * /* args */, PyObject * /* kwds */)
{
return PyErr_Format(PyExc_NotImplementedError,
"Opaque containers of type '%s' cannot be instantiated.",
typeid(SequenceContainer).name());
}
static int tpInit(PyObject * /* self */, PyObject * /* args */, PyObject * /* kwds */)
{
return 0;
}
static void tpFree(void *self)
{
auto *pySelf = reinterpret_cast<PyObject *>(self);
auto *d = get(pySelf);
if (d->m_ownsList)
delete d->m_list;
delete d;
auto freeFunc = reinterpret_cast<freefunc>(PepType_GetSlot(Py_TYPE(pySelf)->tp_base,
Py_tp_free));
freeFunc(self);
}
static Py_ssize_t sqLen(PyObject *self)
{
return get(self)->m_list->size();
}
static PyObject *sqGetItem(PyObject *self, Py_ssize_t i)
{
auto *d = get(self);
if (i < 0 || i >= Py_ssize_t(d->m_list->size()))
return PyErr_Format(PyExc_IndexError, "index out of bounds");
auto it = std::cbegin(*d->m_list);
std::advance(it, i);
return ShibokenContainerValueConverter<value_type>::convertValueToPython(*it);
}
static int sqSetItem(PyObject *self, Py_ssize_t i, PyObject *pyArg)
{
auto *d = get(self);
if (i < 0 || i >= Py_ssize_t(d->m_list->size())) {
PyErr_SetString(PyExc_IndexError, "index out of bounds");
return -1;
}
auto it = std::begin(*d->m_list);
std::advance(it, i);
OptionalValue value = ShibokenContainerValueConverter<value_type>::convertValueToCpp(pyArg);
if (!value.has_value())
return -1;
*it = value.value();
return 0;
}
static PyObject *push_back(PyObject *self, PyObject *pyArg)
{
auto *d = get(self);
if (!ShibokenContainerValueConverter<value_type>::checkValue(pyArg))
return PyErr_Format(PyExc_TypeError, "wrong type passed to append.");
if (d->m_const)
return PyErr_Format(PyExc_TypeError, msgModifyConstContainer);
OptionalValue value = ShibokenContainerValueConverter<value_type>::convertValueToCpp(pyArg);
if (!value.has_value())
return nullptr;
d->m_list->push_back(value.value());
Py_RETURN_NONE;
}
static PyObject *push_front(PyObject *self, PyObject *pyArg)
{
auto *d = get(self);
if (!ShibokenContainerValueConverter<value_type>::checkValue(pyArg))
return PyErr_Format(PyExc_TypeError, "wrong type passed to append.");
if (d->m_const)
return PyErr_Format(PyExc_TypeError, msgModifyConstContainer);
OptionalValue value = ShibokenContainerValueConverter<value_type>::convertValueToCpp(pyArg);
if (!value.has_value())
return nullptr;
d->m_list->push_front(value.value());
Py_RETURN_NONE;
}
static PyObject *clear(PyObject *self)
{
auto *d = get(self);
if (d->m_const)
return PyErr_Format(PyExc_TypeError, msgModifyConstContainer);
d->m_list->clear();
Py_RETURN_NONE;
}
static PyObject *pop_back(PyObject *self)
{
auto *d = get(self);
if (d->m_const)
return PyErr_Format(PyExc_TypeError, msgModifyConstContainer);
d->m_list->pop_back();
Py_RETURN_NONE;
}
static PyObject *pop_front(PyObject *self)
{
auto *d = get(self);
if (d->m_const)
return PyErr_Format(PyExc_TypeError, msgModifyConstContainer);
d->m_list->pop_front();
Py_RETURN_NONE;
}
// Support for containers with reserve/capacity
static PyObject *reserve(PyObject *self, PyObject *pyArg)
{
auto *d = get(self);
if (PyLong_Check(pyArg) == 0)
return PyErr_Format(PyExc_TypeError, "wrong type passed to reserve().");
if (d->m_const)
return PyErr_Format(PyExc_TypeError, msgModifyConstContainer);
if constexpr (ShibokenContainerHasReserve<SequenceContainer>::value) {
const Py_ssize_t size = PyLong_AsSsize_t(pyArg);
d->m_list->reserve(size);
} else {
return PyErr_Format(PyExc_TypeError, "Container does not support reserve().");
}
Py_RETURN_NONE;
}
static PyObject *capacity(PyObject *self)
{
Py_ssize_t result = -1;
if constexpr (ShibokenContainerHasReserve<SequenceContainer>::value) {
const auto *d = get(self);
result = d->m_list->capacity();
}
return PyLong_FromSsize_t(result);
}
static PyObject *data(PyObject *self)
{
PyObject *result = nullptr;
if constexpr (ShibokenContainerHasReserve<SequenceContainer>::value) {
const auto *d = get(self);
auto *data = d->m_list->data();
const Py_ssize_t size = sizeof(value_type) * d->m_list->size();
result = Shiboken::Buffer::newObject(data, size, Shiboken::Buffer::ReadWrite);
} else {
PyErr_SetString(PyExc_TypeError, "Container does not support data().");
}
return result;
}
static PyObject *constData(PyObject *self)
{
PyObject *result = nullptr;
if constexpr (ShibokenContainerHasReserve<SequenceContainer>::value) {
const auto *d = get(self);
const auto *data = std::as_const(d->m_list)->data();
const Py_ssize_t size = sizeof(value_type) * d->m_list->size();
result = Shiboken::Buffer::newObject(data, size);
} else {
PyErr_SetString(PyExc_TypeError, "Container does not support constData().");
}
return result;
}
static ShibokenSequenceContainerPrivate *get(PyObject *self)
{
auto *data = reinterpret_cast<ShibokenContainer *>(self);
return reinterpret_cast<ShibokenSequenceContainerPrivate *>(data->d);
}
};
namespace Shiboken
{
LIBSHIBOKEN_API bool isOpaqueContainer(PyObject *o);
}
#endif // SBK_CONTAINER_H
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